Skip-feed milling machine



G. D. SLINIDSTRANDA sx1? Fup MILLIG Mmmm Filed Feb. 16.

1920 5 sheets-snaai x ATTORNEYS.

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G. D. SUNDSTRAND SKIP FEED AMILLING MACHINE Filed Feb} 16.

1920 5 Sheets$heat swt. 16. 1924. 1,508,825

' G. D. SUNDSTRAND SKIP FEED MILLING MACHINE `Filed Feb. 16. 1920 .5 Sheets-Sheet 3 ffm. :16,1924 G. D. SUNDSTRAND SKIP FEED MILLYNG MACHINE Filed Feb. 16. 92C 5 Sheets-Sheet Patented Sept. i6, i924..

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GUS'IAF DAVID SUNDSTRAND, OF ROOKEO'RD, ILLINOIS, ASSIGNOR TO- ROCKFORD MILLING MACHINE COMPANY, 0F ROCKFORD, ILLHTOIS, A CORPORATION OF ILLINOIS.

SKIP-FEED MILLING MACHINE.

Application led February 16, 1920. Serial No. 359,081.

T0 all 'whom t may concern f Be it known that I, GUSTAF DAVID SUND- STRAND, a citizen of the United States, re-

siding at Rockford, in the county ofVVinnebago and State of Illinois, have invented certain new and useful Improvements in Skip-F eed Milling Machines, of which the following is a specification.

My invention relates to milling machines and more specifically to a milling machine embodying automatic means for moving the work carrying table at dierent speeds during different portions of its travel. The work to be done on milling machines is frequently such that the tool must finish a surface and ,the work must then be moved a considerable distance to bring another surface into position, which is then finished by the same tool without' any readjustment of the tool or work. These surfaces may be different portions of the same piece of stock, or corresponding portions of different pieces of stock, or both. To allow the table to move the intermediate distance at the slow rate necessarywhile cutting is taking place is a waste of time, and to manually change the rate of motion requires the constant attention of the operator. It is desirable. therefore, in machining large numbers of similar parts to provide automatic mechanism which can be set to move the table slowly during the portions of its travel in which machining takes place, and rapidly during intermediate portions of its motion.

It is also advantageous to automatically re-v turn the table to the starting point and yleave itthere at rest until the operator changes the stock and starts the machine again'.

A primary object of my invention is to provide relatively simple and efiicientmeans for performing each of the above mentioned' functions. f

Another object of my invention is to locate the automatic control means in a convenient position out of the way of the operator and removed from dust and dirt, and especially from the metal chips produced by the machine. l A special object of my invention is to provide an. automatically controlled transmission for performing the functions above outlined which may be substituted for the feed box of an ordinary milling machine making it possible to use machines already in service in connection with my improved device, and also economizing by using standard parts for the spindle transmission and the transl mission to the machines.

Another object of my invention is to eliminate the spring actuated lost-motion connections heretofore employed for reversing or changing the speed of the table automatically. The devices of the prior art have table in manufacturing new employed dogs or equivalent elements car- .combination with resilient means tnsioned by the initial movement of the clutch actuating means before stoppage of the table, and adapted to complete the motion of the clutch shifting lmechanism and start the table again. Resilient devices of this sort are so abrupt and spasmodic in their action as to impose severe strains on the transmission of the entire machine and when the clutch teeth are slightly worn they are apt to fail to operate entirely, the teeth chattering past each other, interrupting the operation of the machine, causing objectionable noise, and further wearing away the clutch teeth.

It is an object of my invention to remedy this defect. I may accomplish this by providing for continuedmotion of either the table or some intermediate element of the transmission` between the table and the clutches, after the power feed has beenrdisconnected from the table, so that the next clutch may be actuated by a slow and relatively positive motion into engagement to start the table on the next step in the cycle of operations.

It has 4 Further objects and advantages' of my invention will become apparent as the description proceeds. I

Referring to the accompanying drav'vings,l

Fig. 3 is a detail view of one side of the knee. Fig. 4 is a side elevation of my improved automatic control mechanism a portion of the wall of the casing therefor being broken away to disclose the parts therebehind. Fig. 5 is a front elevation, and Fig. 6 is a plan view of the parts illustrated in Fig. 4. Figs. 7, 8 and 9 are detail views of the manual control connections, and Fig. 10 is a detail view of a dog andv its support.

The embodiment of my invention disclosed comprises a source of power, or power driven element; a table or element to be driven; a transmission from said source of power to a plurality of variously driven clutch elements; and transmission means from a pluralityof co-operating clutch elements to the table. An automatic control element is employed to selectively engage the cooperating clutch elements, and is driven'by two ,transmissions, the first-.being a lost-motion transmission from the table which may come through the power transmission to any convenient intermediate point between the cooperating clutch elements and the table; and the second being an impositive transmission from the source of power which may also come through the power transmission for the power driven clutch elements to any convenient intermediate point. Additional advantages of the particular construction disclosed are the use of clutches normally held out of engagement both by gravity and the resilient action of a spring, and a relatively positive means of moving the clutches into engagement by transmissions in which locking mechanism is interpolated.

l have illustrated my invention in connection with an ordinary milling machine comprisin a column 10y carrying a power element ilistrated as a pulley 11, a spindle 12, an overarm 13, and a vertically slidable knee 14. Any suitable or preferred transmission (not shown) from the power receiving element 11 to the spindle 12 may be employed.. The knee 14 carries a horizontally slidable saddle 15 movable in a line parallel to the spindle, and the saddle carries a transversely slidable table 16 in the customary- Aguy suitable or preferred connections `for transmittin power to the table from the control mec anisms carried by the column 10 may be employed. ll have illustratedv a vertical shaft 17 supported in a casing 18 carried by the knee 14 and passing through bevel gears 19 and 2O in a casing 21 carried by the column 10. The bevel gears -19 and 2O are driven by the bevel gear 22 and may be selectively connected to the shaft 17 by the usual splined clutchelement'operated by the control lever 24. In the position illustrated, the lever 24 is in neutral position and ,shaft 17 is not actuated. rllhe horizontal shaft. 25 receives motion from the shaft 17 Lacasse by suitable bevel gears 26 and extends outwardly beside the knee 14. Motion is transmitted to `the table from the shaft 25 by means of bevel gears 27, vertical shaft 28 and bevel gears 29 driving a rotatable element 3f). rlhis element 30 may, as illustrated, bea sleeve splined tothe feed screw 31 to rotate it in a fixed nut (not shown), or 'it may be a rotatable nut having threads engaging a stationary feed screw.

Any suitable means may be provided for raising and lowering the 4knee and for moving the saddle toward and away from the column by the power delivered to shaft 25. Ihave illustrated artrain of gears 32 transmitting the rotation of the shaft' 25 to gears 33 and 34 rotatably mounted on the saddle feed screw 35l and the feed shaft 36 for the knee respectively. Clutches 37 and 38 may be alternately moved into engagement with their respective gears by a suitable lever 39 having fingers to engage the clutches. The lever 39 is pivotally mounted onthe shaft 40 and may be rocked in either direction by a suitable hand lever 41 on the side of the knee 14. The feed shaft 36 for the knee 14 operates to raise and lower the knee by rotating the vertical feed screw 42 through bevel gears 43.

The above described mechanisms in and of themselves are all old and well known in the art although l believe myself to be the first to combine all of them without change as illustrated with automatic means for controlling the table feed. rlhey also cooperate with my improved automatic control means to produce a novel and beneficial result, as will hereinafter be explained.

The automatic control means ll have provided for determining the speed of the shaft 17 is best illustrated in Figs. 4, 5 and 6 and comprises in this instance, three vertical parallel Shafts 44, 45 and 46 (Fig. 4) geared together by a continuous train of three gears 54, 55 and 56. A bevel gear 47 on the shaft 46 is at all times in mesh with the bevel gear 48 on the horizontal shaft 49 which through suitable intermediate ears 50, 51, 52 and 53 (Figs 1 and 2) and t e shaft 57 drives the bevel ear 22 to deliver power to the shaft 17. 'l e vertical shafts 44, 45 and 46 carry splined clutch elements 64, 65 and 66, respectively.

Power driven clutch elements 74, 75 and 76 overlie the splined clutch elements 64, 65 and 6.6. respectively, and are arranged to be driven in different directions and at dierent speeds to provide different rates of motion for the transmission to the shaft 17 and thence to the table. ll have illustra-ted means for thus driving the power driven clutch elements 74, 7 5 and 76 from the power receiving element 11, comprising gears 58 and 59 (Fig. l), a shaft 60 and a bevel gear 61 meshing with a bevel gear 62 on a vertical messes shaft carrying the clutch element 74. rPhe middle clutch element 75 is driven through gears 63 and 67 which in this instance are arranged to rotate it in the opposite direction at approximately the same rate of speed as the clutch element 74.

The clutch element 76 is driven at a relatively low speed for feeding purposes'. Connections for this comprise a worm wheel 68 on the shaft 69 carrying the clutch element 76 and receiving motion from the worm 70 (Fig. 6) driven through change gears 71 from a bevel gear 72 meshing with the bevel gear 62. The `change gears 71 are mounted on the outer ends of the parallel shafts 73 and 77 carrying the bevel gear 72 and worm 70 respectively, and lie within a casing 78 which may be equipped with a removable cover (not shown). The change gears 71 may be readily removed and interchanged or replaced to provide any desired rate of motion for the low speed or feeding movement of the table.

Power to feed the table slowly 'is transmitted as follows: shaft 60, beveled gears 61, 62 and 72, shaft 73, change gears 71,

shaft 77, worm 70, worm wheel 68, shaft 69, clutch 76-66, shaft 46, beveled gears 47 and 48 and shaft 49.

Power to feed the table rapidly is trans` mitted 'from shaft 60, beveled gears 61 and 62, pinions 63 and 67, clutch 7 5-65, shaft 45, gear wheels 55 and 56, shaft 46, beveled gears 47 and 48 to shaft 49.

Power to return the table rapidly to starting position is derived from shaft 60, beveled gears 61 and 62, clutch 74-64, shaft 44, gears 54, 55 and 56, shaft 46, beveled gears 47 and 48 and shaft 49.

"The means for automatically shifting the clutch elements 64, 65 and 66 which control vthe motion of the table will now be deshaft 7 9a are three bell crank levers 79 which are associated with each of these clutch elements and at their upper ends are socketed in transverse slides or control rods 84, and 86 (Fig.- 6). A roller 80 may be carl ried by each lever 79 to engage the peripheral groove 81 in the splined clutch element. Resilient means which I have illustrated as a short compression spring 82 (Fig. 5) is associated with each of the transverse slides 84, 85 and 86 tending normally to hold the clutch elements out of engagement. In the arrangement shown the weight of the lower clutch element assists the action of lthe spring.

A drum 83 (Fig. 1) comprising-four disks 87, 88, 89 and 90 (Fig. 5), three of which have bosses 91 entering depressions 92 in the adjacent disks, is adapted to carry a plurality of dogs 93 (Fig. 10) peripherally spaced in each of the three grooves 94, 95 and 96 formed between the disks. Each dog 93 (see ing.- 1o) vis, mounted is a. block e7 adapted to rest in any one of the grooves 94, 95 and threaded into disk 90. Any desired number' et blocks 97 may be suitably spaced in each of the slots and the automatic action of the table will be determined by this spacing.

Referring to Fig. 10, it will be seen that each dog is pivotally mounted in-its block by the engagement of its cylindrical base 99 in a socket in the block. A. small groove 100 cut in the block 97 runs around a' portion of the periphery 'of the socket and contains a small tensionspring 101 suitably attached at 102 and 103 to the block 97 and the base 99 respectively. llt will be apparentthat as the parts illustrated in Fig. 10 m'ove to the right, the dog will engage any object imposed in its path, being positively prevented from yielding by abutment against' .the

shoulder 107 of the block 97. 0n motion in the opposite direction, however, the spring 101 will allow the dog to yield by rot-ation andhpass under any obstacle imposed in its pat "Rocker elements 104, and 106 (Fig. 5) are pivotally supported on a suitable pintle 108 over the'slots 94, 95 and 96 respectively and are adapted to be engaged and actuated by the dogs 93. As best illustrated in Figs.`

4 and 5, each of the rockers comprises an arm 1 09 overlying approximately one-half of its groove and an oppositely extending arm 110 overlying the other half. The dogs 93 are *of4 two`kinds, those illustrated in Pig. 5 being each adapted to shift its rocker in one direction which as illustrated happens to be the direction to engage'the corresponding cluteh element. A similar dog having its outwardly projecting portion underlying the other arm 110 of 'its rocker is employed to release a clutch. The rockers 104, 105 and 106 carry gear teeth 11 meshing with rack portions 112 on longitudinal slides 114, 115 and 116. The slide 114 is 4slide. 84 is locked in lace vand cannot be moved until slide 1141s returned to initial position. 1 v

Slide 116 wherel it passesunder slides 85 and 86, and slides 114.and 115 where they pass under slides 85 and 84 have their upper faces notched, or cut down, as at 119, (Fig.`6)

to allow them to move through the required distance, without interference. Slides 115 and 114 are also cut away on one side-oppo site the ends of slides 86 and 85 for Dthe same purpose.

After the continued rotation of Ithe drum 83 has automatically disconnected whichever one of the clutches 64, 65 or 66 was in engagement, and thereby has disconnect-ed just below described. Another reason for providing this form of connection as above referred to 'is to make the movement of the clutches slow and relatively positive as distinguished from the ordinary spring-actuated lost motion connections hereto-tore employed. l

` A vertical shaft 120 (Fig. 5) carrying-,a

worm 121 is driven through gears 122 and 123 from the vertical shaft 46 which is continually engaged with the transmission to the table through the bevel gears 47 and 48 (Figs. `4 and 5). This shaft will therefore rotate when the table moves and reverse its direction of` motion when the table is reversed. A worm wheel 124 (Fig. 6) carrying a pinion 125 integral with or fixed to it, is drivenV by the worm 121; and the pinion 125 meshes with a gear 126 rotatable on the shaft 127 carrying the drum 83. A similar gear 128 (Fig. 6) is constantly urged in one direction only, regardless of the motion of the table.

The connections for this comprise a shaft 129 carrying a worm 130 and driven through gears 131 and 132 from the upper vertical shaft 69.' This shaft is constantly driven in an unvarying direction through the change gears 71 and the worm 7 0 and worm wheel 68 independently of the motion of the table. that meshes with the worm 129 is rotatable on the same supporting shaft 133 as the worm wheel 124. A pinion 135 rotatably mounted on the sleeve .136 carried by worm wheel 134 meshes with the gear 128 and is Afrctionally urged to rotate with the worm wheel 134 by means of a friction washer 137 interposed between them.

Any suitable means for maintaining a proper pressure on the friction washer 137 may be provided.

l have illustrated a nut 138 threaded on the sleeve 136 and a compression spring 139 placed under compression between the pinion 135 and nut 138. The pinion may The worm wheel 134 grooved to provide a seat for the spring as shown.

The gear 128 is keyed to the shaft', thereby constraining the drum 83 to rotate in exact accordance with the motion-imparted to it. A lostmotion connection between the gears 126 and 128 has been provided in the nature of a pin 140 carried by one of the gears 126 and entering a peripheral notch 141 cut in the sleeve carrying the other gear 128. The speed ratio of the transmission to the frictionally driven gear 128 is suchthat it tends to rotate at a slightly lower speed than the ypositively driven gear 126 when the table is being fed. During the feeding operation therefore, the positively driven gear 126 will move faster than the gear 128 until the pin 140 as illus- ,trated in Fig. 6, comes to the end ot the notch 141 driven gear 128 will be constrained to rotate` in unison with the positively driven gear 126 carrying the drum with it and forcing the pinion 135 to slip on friction washer 137. As soon as the clutch, which in this instance is clutch 66, is disen aged, the motion of the table and of the positively driven gear 126 will cease. The transmission to the yfrictionally` driven gear 128, however, will continue to operate and rotate the shaft 127 and drum 83 through a distance corresponding to the play allowed by the notch 141 which will be adequate to bring another dog, carried tor instance in the slot 95, under the rocker 105 thus engaging clutch 65 and imparting a rapid or traverse movement to the table. When this occurs the positively driven gear 126 will immediately overtake the trictionally driven gear and carry it along forcing the Jfrictional connection to slip.

At the end of the traverse the disconnection `of clutch 65 will again arrest the table and the frictionally driven gear will as before continue the motion ot .the drum far enough to throw in another clutch, `t'or instance, the feed clutch 66, to start the table again at a low speed. At the end ot the stroke of the table, the feed or traverse clutch'as the case may be, will be automatically disengaged and the continued motion of the drum 83 will throw in the return clutch 64. The table will thereupon be returned rapidly to its original position where a dog in slot 94' will engage rocker 104 to disconnect the return clutch, thereby arresting the motion of the table. This last dog after which the frictionally lll) When the stoppage of the table arrests the motion of the gear 126, therefore, the frictionally driven ear 128 will be 'at the extreme limitof t e relative motion allowed by the notch' 141 and as the friction transmission tends to move it in the opposite direction .from that in which it has been forced'to move by the positively driven gear 126 it will remain in this position held by the tendency of the transmission to move it in opposition to the last motion of the positively driven gear. The drum, therefore, will stop dead, and no further operation of the machine will-occur. until it is started again bythe operator.

haveillustrated suitable manual control connections for this starting operation and also for complete manual control of the motions of the table when for any reason it is preferable not to employ the automatic control. The longitudinal slides 114, 115 and 115 are enclosed in a casing 142 extending along' the side of the column 10 and terminating near the end of a vertical control column 143 comprising a sleeve 144 and a shaft 145 extending inside the sleeve and rotatable therein. The connections between the vertical control column and the longitudinal slides 114, 115 and 116 are clearly illustrated in Figs. 7 and 8 and comprise apair of ears 146 and 147 extending in opposite directions from the sleeve 144 and having slotted connection with pins 148 carried by the longitudinal slides l114 and 116 respectively. It will be apparent that rotation of the vsleeve to advancel either slide 114 or 116 to enga e its clutch will retract the other slide. t is therefore impossible to damage the machine which i might otherwise be caused by simultaneously connecting clutches 64 and 66 to transmit power to the table.

The slide 115 may be controlled by rotation of the shaft 145 which is connected to it by an arm 149 extending through an arcuate slot in the sleeve 144 and a connecting link 150.4 To absolutely prevent simultaneous operation of the central slide 115 and either of the slides 114 and 116, I have provided automatic stop means in the nature of a small casing 151 (see Fig. 7) adjacent the ends of the slides and carrying At the top of the control column I have provided suitable manual control means inl the nature of a control lever 154 (Figs. 8 and 9) pivoted on a horizontal pintle 155 carried by a ring 156 encircling a boss 157 on the arm 158 which forms a support projecting from the column 10 to brace the upper end ofthe control column 143i The 157 so that the lever and its supporting ring 156 may be rotated to rotate the sleeve 144.

After having rotated the sleeve it is impos-v sible to engage and rotate the shaft 145 without returning the sleeve to neutral position, after which the head 162 may be ter the notch 161 and subsequent rotation of the lever 154 and ring will rotate the shaft 145. 1n machines equipped with the casing 151 of F ig. 7, the projections 163 or anyequivalent safety means may be omitted.

In using my improved device, the bolts 98 are loosened and any desired number'bf vdogs are inserted in the slots 94, 95 and 96.

to provide automatic alternation from feed -moved up' between'the projections 163 to enao l to traverse and back again and auto tic v return to the initial position, correspon ing to the sizes and shapes of the articles to be machined. The tightening of the bolts will then securely. clamp the dogs 93 in place.

The periphery of the drum may be suitably graduated into spaces corresponding to inches of motion of the table 16 or into any other convenient unit to facilitate the setting of the dogs. The work may then be placed on the table, moved to initialvposition and the clutch lever 24 thrown into neutralv while the operation of the transmission up to the clutch controlled by said lever ma be allowed to carry the drum through lts cycle of operations to` see that the dogs are properly set. When thevdrum has reached the proper position,the table may be connected to it by operatingthe clutch lever 24 and the machine may thereafter be operated by relatively unskilled labor as all that need be done is to remove the castings or work from the table each time the machine stops, replace them with new stock and.start the table by operating the hand lever '154. j

' The ability to register or change the re ister of the table and work without distur -i the spacing of the/dogs on the drum resu ts from the location of the clutch control 24 in its customary position, which makes it possible to disconnect the entire automatic control land allow it to move through part of a cycle without disturbing the position of the table. lin the devices of the prior art the automatic clutch shifting elements have ordinarily been mounted on and carried by the table itself and any change of register necessitated readjusting all the dogs used. In my improved device, however, not only may the original set up be facilitated by this means, but in case a partially broken cutter stalls the machine or forces the clamps holding the work on the table to slide, the displacement of the work need not be remedied, as. after a new cutter has been provided the clamps can be tightened and the drum shifted slightly with respect to the table to compensate for the shifting of the work. My improved automatic control device is also located entirely out of the way of the workmen and where it will not be' interered with by chips, dirt or the tools freuently laid on or near the table or saddle.

t may also be substituted for the box which is customarily carried on the side of a column of many standard makes of milling Y machines and may thus be applied by means of only slight alterations tormilling in achines at present in use as well as permitting the use of standard castings and parts for the column, knee, saddle, table, and most ofthe transmission to the knee, saddle and table, in manufacturing new machines.

i While lhave described and illustrated in detail a specific embodiment of my invention, -it should be clearly understood that the description is only for purposes of illustration and that many modificationsand vay riations will naturally occur to those skilled in the art.

ll aim in the subjoined claims to cover all such legitimate variations and modifications.

l claim as my inventiom' 1. In a machine of the class described, a

i column, a table, a source of power for said column, a table, a source of power for operating said table, a feed box portion in said column, power transmission for said table comprising a drive gear and a driven gear in said feed box portion, an automatically operating control device adapted to be interposed in said feed box portion and havin connection between said drive gear and driven gear said device comprising change speed and reversing means adapted to be set f manually and to operate automatically in incassa nection between said control elements and said transmission and means for continuing the motion of saidv control elements after stoppage of said table to the extent oi the motion allowed by said lost motion connection.

4c. lin a device of the class described, a source of power, an element to be driven, a power transmission between said source and said element, control means interpolated inl said power transmission, a control transmission from said power transmission to said control means, and meansv for continuing the actuation of said control means after the power transmission to said element has been disconnected.

5. In a device of the class described, a source of power, an element to be driven, a power transmission between said source and said element, control means for said power transmission, a control transmission from said power transmission to said control means and means for disconnecting said element from said power transmission and control transmission.

6. In a device of the class described, a source of power, an element to be driven, a power transmission from said source to said element, a movable control member, control elements carried by said member, a control transmission adapted to be actuated by said elements to control said power transmission, and a\ lost motion connection between said control member and an intermediate element of said power transmission.

7. ln a device .of theclass described, a source of power, an elementto be driven, a power transmission from said source to said element, a drum, control elements carried in said drum, a control transmission adapted to be actuated by said elements to control said power transmission, a lost motion connection between said drum and a portion of said power transmission, and means for dis. connecting said driven element from said s power transmission without disconnecting said drum.

8. In a device of the class described, a source of power, an'element to be driven, a power transmission from said source to said element, a drum control elements carried by said drum, a control transmission adapted to be actuated by said elements to con-trol said power transmission, a lost motion connection between said drum and a portion ot said power transmission', and impositive driving means tending to actuate said drum from said source of power.

9. lin a device of the class described, a

i'io

column, a table, a source of power carried by said column, a power transmission from said source to said table, a control device carried by said column for automatically controlling said power transmission, a control transmission from an intermediate element of said power transmission to said c-oiitrol device, and al lost motion connection interpolated in said control transmission.

10. In a device of the class desc-ribed, a column, 'a table,'a source of power carried by said column, a power transmission from said source to,said table, a control device carried by said column for automatically controllingl said power transmission, a control transmission from an intermediate element of said power transmission to said control device, anda lost motion connection including a friction drive means between said power transmission and said element.

11. In a device of the class described, a column, a table, a source of power carried by said column, a power transmission from said source to said tab-le, a .control device carried by said column for automatically controlling said power transmission, and a lost motion connection including a friction drive extending from said control transmission to said control element, and tending to actuate it always in the same direction.

12. In a device of the class described, a source of power', an element to be driven, a power transmission from said source to said element, a control device adapted to control said power transmission, and two control vtransmissions from. intermediate portions of said power transmission, one of said control transmissions including a friction driveand being directly connected to said control device, and the other of said con-trol transmissions having a lost motion connection with said control device.

' 13. A device of the class described having, in combination, a source of power, anl

element to be driven, means for moving said element at various speeds land in different directions through a complete cycle, said means including a plurality of spaced elements adjustable to determine the cycle, and means for shifting the portion of the total travel of said element within which said cycle takes place without disturbing the adjustment of said elements.

14. In a device of the class described, a source of power, a plurality of clutches continuously actuatedr in various directions and at various speeds'from said source of power, `an element to be driven, a transmission adapted to deliver power to lsaid element,

means for selectively connecting said transmission to said clutches, an impositive drive actuated continuously from said source of and having a lost motion connection with said selective connecting means.

15. In a device ofthe class described, a

source of power and a plurality of clutch y a positive drive including a lost-motion connection between said element and said connectingmeans, and an impositive drive between said source of power and said connecting means. i

16. In a deviceof the class described, a source of' power and a plurality of `clutch elements continuouslyactuated in Various directions and at various speeds from said source of power, an element to be driven, a transmission adapted to deliver power to said element, means forl selectively connecting said transmission to said clutches, a positive drive including a lost-motion connection between said elementI and said connecting means, and an impositive drive between' said source of power and said connecting means. said. impositive drive tending to actuate said connecting means always in the same direction regardless ot the direction of motion of said element.

17. In a device of the class described, a work table, a source of power, a' transmission from said source to said table, a rotary control element operated from an element of said transmission adapted to automatically control the motion of said table, and a lostvmotion connection between said transmis- 'said -rotary control element carrying means for disconnecting said table at predetermined oints from said source of power and for su sequently re-establishing a connection, .and means for continuing the motion of said rotary element after said table has been disconnected from said source of power through the extent of motion allowed. by said lost motion connection, to re-establish a connection. H

19. In a device of the class described, a work table, a source of power, a transmission from said source to said table, a rotary control element .adapted to automatically control vthe motion of said table, and a lostmotion connection between said transmission and said rotary control element, said rotary control element carrying means for discon-l necting said table at predetermined points from said'source of power and for subsequently re-establishing a connection, and means for continuing the motion of said rotary element aftensaid table has been disconnected from said source of power to re establish a connection, said means for continuing thel motion of said rotary control element being operative during motion of said table and control element in one direction and inoperative during motion in the other direction.l A

20. In a device of the class described, a work table, a source of\power, a transmission from said source to said table, a rotary control element adapted to control said transmission, a lost-motion connection between said transmission and said rotary element, and a friction drive connection between said source and said rotary element.

21. In a device of the class described, a work table, a source of power, a transmission from said source to said table, arotary control element adapted to control said transmission, a lost-motionjconnection between said transmission and said rotary element, and a friction drive connection between said source and said rotary element, said friction drive tending to actuate said element always in the same direction.

l 22. ln a device of the class described, a work table, means for intermittently moving said work table in one direction through various portions of its stroke at various speeds, andI means for reversing the direction of motion'of said table at one end of its stroke and means for reversing the direction of said table in operation independently of the action. of said last mentioned means.

23. In a device of the class described, a column, a knee supported by said column, a saddle supported by said knee, a table supported-by said saddle, a source of power, a transmission from said source to said table, and an element remote-from said knee, saddle and table, said element carrying means 'adapted to automatically control'said transmission.

24. ln a device of the class described, a column, a knee supperted by said column, a saddle supported by saidknee, a table supported by said saddle, asource of power, a transmission from said source to said table, and 'anelement remote from said saddle and table, said element carrying means adapted to automatically control said transmission.

25. ln a device of the class described, a source oit' power, a table, a plurality of clutch elements variously driven from said source of power, a plurality of connecting elements each adaptedto connect one of said clutch elements to said table, a rotary member having a plurality of peripheral grooves one for each connectmg element, adjustable means mounted insaid grooves, a plurality fof transmissions from said adjustable means Lacasse to said connecting elements, andv automatic means for preventing simultaneous actuation of more than one of said transmissions to move its connecting element into operative position. i

26. lin a device of the class described, a source of power, a table, a plurality of clutch elements variously drivenvfrom said Source of power, a plurality of connecting elements each adapted to connect one of said clutch elements to said table, a rotary member having a plurality of peripheral grooves one for each ,connecting element, adjustable means mounted in said grooves, a plurality of transmissions, .each including locking mechanism, from said grooves to said con# necting elements, and automatlc means for preventing simultaneous actuation of more than one of said transmissions to move its connecting element into operative position.

27. ln a device of the class described, a source of power, a table, a plurality of clutches normally resiliently held out of engagement and adapted to actuate said table rom said source of power at various speeds and in various directions, and manual means for selectively forcing said clutches into engagement, said manual means including a transmission having a locking action.

28. lin a device of the class described, a soure of power, a table, means for connecting said source of power to actuate said table at various speeds and in various directions, an automatic control element, a plurality of transmissions each having a locking action and actuated by said control element to engae said various connecting means, and aditional manual selective control means connected to intermediate elements of said transmissions.

29. llna device of the class described, a source of power, a table, means for connecting said source of power to actuate said table at various speeds and in various directions, an automatic control element, a ,plurality of transmissions each having a locking action and actuated by said control element to engage said various connecting means, and additional manual selective control means connected to intermediate'elements of said transmissions, said locking mechanisms being located between said manual control mechanism and said connecting means.

30. lln'a machine of the class described, the combination of a table to hold work to be machined, a column alongside said table comprising an overarm portion to support llO a driven tool spindle over the work, a source y isc of power, a transmission from said source to said table including a plurality of clutches, a control device impositively driven from the live side of said transmission to operate said clutches, said device being capable of engaging and disengaging clutches on the forward stroke and at one end of the stroke only to engage a clutch to cause a reversal of the movement of said table.

32. In a machine ofthe class described the combination of a table to support work to be machined, a driven tool'spindle over said table, said table being adapted to reciprocate with respect to said spindle and to move on its forward stroke at variable speeds and' on'its return stroke to move quickly at a uniform speed, a power transmission to said table, said transmission including clutch elements, a control device adapted to operate said clutches depending upon the position and direction of movement of said table, said control device being actuated to operate the reversing clutch during the forward stroke of the table, whereby the table motion is arrested and reversed, and manually operable means to operate said clutches to start'said table again at the end of each cycle of movements.A

33. In a machine of the class described,

the combination of an element to be driven, a source of power, a ower transmission between said source an said element, said transmission comprising clutch members, a control device operated from said power transmission comprising clutch dogs, clutch levers operated thereby, movable elements associated with said clutch levers, a manual control device connected therewith adapted to move said elements to operate said clutch levers independently of said clutch dogs.

34. In a machine of the character described a reciprocatory element to be driven, power transmission for said element, control means for said transmission to produce variable speeds oflmotion'of said element and in different directions, said transmission including clutch members adapted each to be engaged for a certain speed or motion of said element and to be disengaged before the engagement of another clutch corresponding to another speed or motion, and means operable upon the engagement of one ofsaid clutches tol prevent the engagement of another ending its own disengagement. l'

35. n a device of the class described, a plurality of power driven clutch elements, a

plurality of clutch elements connected to a transmission, anl oscillating drum and means associated with said drum for automatically and selectively actuating said clutches into operative engagement in a predetermined sequence during oscillation'of said drum.

36. In a device of the class described, a column, a table, a source of power carried by said column, a power transmission from said source to said tab-le, a lcontrol device carried by said column for automatically controlling said power transmission, a control transmission from an intermediate element of said power transmission to said control device, and manual meansfor interrupting said power transmission between said table and said intermediate element.

37. In a device of the class described, a source of power, a table, a plurality of clutch elements variously driven from said source of power, a plurality of connecting elements adapted to connect various clutch elements to said table, and a selective manual control adapted to actuate said connecting elements into connection with said clutch elements.

38. In a device of the class described, a reciprocating table, a source of power, a power transmission between said table and said source, an oscillating rotary control device, a 10st motion connection between said power transmission and said device whereby the motion of the'control device may be varied from the motion of the table by the amount of the lost motion.

39. A device of the class describedl having a driving shaft, a power transmission, a control device within said transmission, a driven shaft, said transmission having a series of selectively operated clutches controlled by' said control device whereby continuously rotary motion of the driving shaft is converted to oscillating rotary motion of the driven shaft at a variety of speeds.

40. An attachment for a. machine of the sort described, said machine having a driving element and a driven element, said attachment comprising a power transmission adapted to connect said driving and driven elements, an automatic control device operated by said transmission, said transmission having a plurality of selectively operated clutch elements operated by the control device whereby continuously rotary motion received from said driving element is converted lto oscillatory rotary motion at a variety of speedsand delivered to said driven element.

In testimony whereof, I have' hereunto set` Y 

